Epson Stylus Pro 7600 Photographic Dye Ink, Service Manual

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EPSON Stylus Pro 7600/9600 Revision A
Operating Principles Outline of Power Supply Circuit Board 120
2.4 Outline of Power Supply Circuit Board
The 100 V AC power from the wall outlet is supplied via the power cable, an accessory
of Stylus Pro 7600/9600, into the Inlet of the printer and to the Power Supply Circuit
Board.
The power switch constitutes a secondary power switch system. The secondary power
switch system operates as follows: even with the power switch turned off, the Power
Supply Circuit Board is operating by a slight power as long as the power cable is
connected.
The Power Supply Circuit Board is equipped with a fuse for overcurrent protection.
Table 2-9 below indicates the rating of the fuse:
There are three control signals between the C472MAIN Board and the Power Supply
Circuit Board. Table below describes details of the control signals:
C A U T I O N
Even after the power switch is turned off, the Power Supply Circuit
Board does not stop operating immediately, but power is kept on
until the ink system ending sequence is completed.
Do not disconnect the power cable or do not shut off power by
turning off any power switch other than that on the printer.
Table 2-9. Fuse Rating
Input Voltage Range [V AC] Fuse Rating
100 +/– 10% 125 V AC / 6.3A
Table 2-10. Control Signals between C472MAIN Board and Power Supply Board
Signal Name Function
REM_ON
(MAIN
→
Power Supply)
Operating Turned ON/OFF by C472MAIN Board.
• When these terminals are shorted, the drive system
power supplies 28 VDC and 42 VDC are active.
Off • When these terminals are open (= L), the drive
system power supplies 28 VDC and 42 VDC are 0
VDC.
• The 5 VDC power is not controlled with these
terminals.
AC_OFF
(MAIN
←
Power Supply)
Operating
(= H) When each output from the Power Supply Circuit
Board has become inactive because of turning off of
the power switch or when the input voltage has
dropped below the rated voltage value, “H” signal is
sent to the C472MAIN Board.
Off
(= L) The power switch is turned on and the Power Supply
Circuit Board Unit starts operating so that each output
becomes active.
“H” signal is sent to the C472MAIN Board.
POW_ON/OFF
(Panel /
MAIN
→
Power
Supply)
Operating Connected to the power switch on the Panel Unit.
• These terminals are shorted when the switch is ON.
The Power Supply Circuit Board becomes active.
Off • These terminals are open when the switch is
OFF.The Power Supply Unit keeps operating for
about ten and several seconds to a few minutes and
then turns off.